3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $var = array( 'a' => 'a', 'b' => 'b', ); foreach ($var as $value) { } var_dump(key($var));
based on RuOVb
Output for 7.0.0 - 7.2.0
string(1) "a"
Output for 4.3.0 - 5.6.28
NULL